Note This fix does not resolve any specific errors that you see while populating the buffer pages. It only exposes information about error codes and operations on buffers so that additional troubleshooting can be performed with the new information. The timeout and performance issues are generic in nature and can have many underlying root causes. In this particular case, there are many errors and retries which are observed while trying to read data pages from data files and populating the memory Buffers memory representation of data pages.
The root cause for buffer population errors are not identified clearly as the underlying error codes while trying to populate the buffers that are not exposed. Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:. Latest cumulative update for SQL Server Learn about the terminology that Microsoft uses to describe software updates. Need more help?
You mention updating client timeouts to a higher value should help. Is there another parameter that I should update, or are you referring to the 1 I have already updated? Sign in. United States English. Ask a question. Quick access. Search related threads. Remove From My Forums. Answered by:. Archived Forums. In this case, you need to ensure the SQL browser service is indeed started and UDP port is not blocked on the firewall between the client and the server.
In this case, you need to ensure that the static port is specified in your connection string and that port is not blocked by the firewall. If this does not resolve your issue, move to Still having problems section. If you are using a custom firewall, work with your network administrator to open up the necessary ports. Below you can find some quick screenshots showing the required configuration of a Windows firewall for successful connections to a default instance and a named instance.
In this scenario, you need to ensure an exception is added to TCP port in the Windows firewall. Select Specific local ports and specify the value as and click Next. In the next screen, select Allow the connection and click Next.
In the next screen, select the option that best suits your environment and click Next. In the next screen, give the name to your rule and provide a clear description for future reference and click Finish. Download location: PortqryUI. For more information, move to Configuring firewalls section. One of these is for the IP address of the loopback adapter, You will probably see both IP version 4 and IP version 6 addresses.
Right-click each address, and then click Properties to identify the IP address that you want to configure. If it contains a specific number, it means the database instance is listening on a static port. For more information about the no connection error, move to The full error message section.
Therefore, SSPI allows for a computer that is running a Windows operating system to securely delegate a user security token from one computer to another over any transport layer that can transmit raw bytes of data. For additional information as to why the Kerberos operations cannot be completed, move to Troubleshooting authentication failures due to Kerberos issues section to review and implement the steps.
Kerberos authentication failures can happen due to a variety of reasons. The major causes and corresponding resolutions are highlighted below:. But, if the service account does not have these rights the automatic SPN registration does not happen and you need to work with your Active Directory administrator to register these for the SQL instances to enable Kerberos authentication.
In this scenario, if you are using a named instance, it will be more convenient to use a static port for that instance. If you use dynamic ports, the port number can change each time the service is restarted and the manually registered SPN for the instance is no longer valid.
Launch the tool using a domain account preferably with an account that has sufficient privileges to create SPNs in your active directory. See the below picture:. Use this tab to find the missing or misconfigured SPNs and the Generate or Fix buttons to fix these issues. Generate option will let you create the SPN Generation script.
Clicking on the Generate button kicks off the following dialog:. The tool only provides Fix and Generate options for default instances and named instances with static ports. For named instances using dynamic port, the recommendation is to switch from dynamic to static ports or give necessary permissions for the service account to register and unregister the SPN each time the service is started.
Delegation tab : The tab identifies any issues with the service account's configuration for delegation. This is especially useful in troubleshooting linked server issues. For example, if the SPNs check out fine but if you still run into issues with linked server queries it could be an indication that the service account is not configured to delegate credentials. For additional information review the Books online topic at Configuring Linked Servers for Delegation.
Once you fix the SPNs, rerun the Kerberos Configuration Manager tool, and ensure the SPN and Delegation tabs no longer report any error messages and retry the connection from your application. Kerberos Technical Supplement for Windows. How to get up and running with Oracle and Linked Servers. Login failed for user ' null '. Login failed for user is empty. There are at least three scenarios for this issue. Use the following table to go through each applicable scenario and take the appropriate resolution steps.
The main reason for this is that the SPN is associated with the wrong account. To diagnose and resolve these SPN issues, move to Troubleshooting authentication failures due to Kerberos issues section.
If the domain name is not specified, then it is a failing SQL login. If it is specified, then it is a failing Windows-Integrated login. Review the following table for causes and potential resolutions. For additional tips, review Troubleshooting: Login Failed for User 'x'. You can also see this with IIS applications that use Anonymous login or Form's login where the user account is not impersonated.
This error typically happens if the user is logged in with a local account rather than a domain account. If connecting to services off-box, then the machine credentials may be passed. In some cases, you can add this account as a login on the back-end server. In other cases, you may want to login with a domain account and provision appropriate permissions to that account to access the remote service.
Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. SqlException 0x : Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgment. This could be because the pre-login handshake failed or the server was unable to respond back in time. Win32Exception 0x : The wait operation timed out.
SqlException 0x : Timeout expired.
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